Return index of cell in a cell array for which contains a desired element

I have a cell array:

C = {[1,2,4], [3,5], [8,9]}

I would like to have a function, such that:

somefunc(C, 2) % will return 1, indicating that 2 is in the 1st cell of the cell array
somefunc(C, 8) % will return 3, indicating that 8 is in the 3rd cell of the cell array
somefunc(C, 7) % will return 0 or -1 or whatever that is not 1 or 2, or 3

Is there any MATLAB built-in function that could achieve this purpose?

Thanks in advance!

(Assume the elements in the cell array are unique.)

Answer 1

[Voss]

C = {[1,2,4], [3,5], [8,9]};

find(cellfun(@(x)ismember(2,x),C))

ans = 1

find(cellfun(@(x)ismember(8,x),C))

ans = 3

find(cellfun(@(x)ismember(7,x),C))

ans =

  1×0 empty double row vector

[Voss]

Or, making that command into a function you can call:

C = {[1,2,4], [3,5], [8,9]};

find_cell_containing(C,2)

ans = 1

find_cell_containing(C,8)

ans = 3

find_cell_containing(C,7)

ans =

  1×0 empty double row vector

function idx = find_cell_containing(C,in)
    idx = find(cellfun(@(x)ismember(in,x),C));
end